Ohto, Umeharu
Shibata, Takuma
Tanji, Hiromi
Ishida, Hanako
Krayukhina, Elena
Uchiyama, Susumu
Miyake, Kensuke
Shimizu, Toshiyuki
Article History
Received: 18 February 2014
Accepted: 3 December 2014
First Online: 9 February 2015
Competing interests
: The authors declare no competing financial interests.